[Code of Federal Regulations]

[Title 49, Volume 2]

[Revised as of October 1, 2005]

From the U.S. Government Printing Office via GPO Access

[CITE: 49CFR179.100-8]



[Page 1038]

 

                        TITLE 49--TRANSPORTATION

 

   CHAPTER I--PIPELINE AND HAZARDOUS MATERIALS SAFETY ADMINISTRATION, 

                      DEPARTMENT OF TRANSPORTATION

 

PART 179_SPECIFICATIONS FOR TANK CARS--Table of Contents

 

 Subpart C_Specifications for Pressure Tank Car Tanks (Classes DOT-105, 

                         109, 112, 114 and 120)

 

Sec. 179.100-8  Tank heads.



    (a) The tank head shape shall be an ellipsoid of revolution in which 

the major axis shall equal the diameter of the shell adjacent to the 

head and the minor axis shall be one-half the major axis.

    (b) Each tank head made from steel which is required to be ``fine 

grain'' by the material specification, which is hot formed at a 

temperature exceeding 1700 [deg]F., must be normalized after forming by 

heating to a temperature between 1550[deg] and 1700 [deg]F., by holding 

at that temperature for at least 1 hour per inch of thickness (30-minute 

minimum), and then by cooling in air. If the material specification 

requires quenching and tempering, the treatment specified in that 

specification must be used instead of the one specified above.



[29 FR 18995, Dec. 29, 1964. Redesignated, 32 FR 5606, Apr. 5, 1967 and 

amended by Amdt. 179-12, 39 FR 15038, Apr. 30, 1974]